Higher structure maps for free resolutions of length 3 and linkage
Commutative Algebra
2023-03-16 v3
Abstract
Let be a perfect ideal of height 3 in a Gorenstein local ring . Let be the minimal free resolution of . A sequence of linear maps, which generalize the multiplicative structure of , can be defined using the generic ring associated to the format of . Let be an ideal linked to . We provide formulas to compute some of these maps for the free resolution of in terms of those of the free resolution of . We apply our results to describe classes of licci ideals, showing that a perfect ideal with Betti numbers is licci if and only if at least one of these maps is nonzero modulo the maximal ideal of .
Keywords
Cite
@article{arxiv.2208.05934,
title = {Higher structure maps for free resolutions of length 3 and linkage},
author = {Lorenzo Guerrieri and Xianglong Ni and Jerzy Weyman},
journal= {arXiv preprint arXiv:2208.05934},
year = {2023}
}
Comments
33 pages